Take advantage of your time

One of the places I love getting a quick workout in is in the shower. Blast a song thats easy to dance to and just dance. You will easily get an extra five minutes of abs and legs by dancing around. Continue moving while you pick out outfits, brush your teeth, and get dressed.
Other fun ideas...
Always take the stairs.
Park far away from your destination. Whenever I go to the grocery when the weather is nice, I try to take the farthest parking spot so I get the extra walk.
Standing in line is not always the greatest place to work-out but a great place to plan work-outs or meals.